This comprehensive dictionary of botany has been revised and covers over 5500 clear and concise entries. There is wide coverage on topics including biochemistry, plant physiology, cytology, ecology, genetics, evolution, biogeography, Earth history, and the Earth sciences. Also included is worldwide coverage of taxonomic groups - one-third of the entries are devoted to taxa, from bacteria and fungi to the main groups of flowering and non-flowering plants. New entries have been added from the field of molecular biology.